Static CBMEM / CAR: Flag boards with BROKEN_CAR_MIGRATE

Use of CAR_GLOBAL is not safe after CAR is torn down, unless the
board properly implements EARLY_CBMEM_INIT.

Flag vulnerable boards that only do cbmem_recovery() in romstage on S3
resume and implementation with Intel FSP that invalidates cache before
we have a chance to copy the contents.

Change-Id: Iecd10dee9b73ab3f1f66826950fa0945675ff39f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5419
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/Kconfig

@@ -170,6 +170,15 @@ config EARLY_CBMEM_INIT
 	  some, for instance, execution timestamps. It needs support in
 	  romstage.c and should be enabled by the board's Kconfig.
 
+config BROKEN_CAR_MIGRATE
+	bool
+	default y if !EARLY_CBMEM_INIT && HAVE_ACPI_RESUME
+	default n
+	help
+	  Many boards use CAR_GLOBAL but have no EARLY_CBMEM_INIT and
+	  manage CAR migration on S3 resume path only. Couple boards use
+	  CAR_GLOBAL and never do CAR migration.
+
 config DYNAMIC_CBMEM
 	bool "The CBMEM space is dynamically grown."
 	default n

src/arch/x86/boot/Makefile.inc

@@ -1,5 +1,5 @@
 romstage-$(CONFIG_EARLY_CBMEM_INIT) += cbmem.c
-romstage-$(CONFIG_HAVE_ACPI_RESUME) += cbmem.c
+romstage-$(CONFIG_BROKEN_CAR_MIGRATE) += cbmem.c
 
 ramstage-y += boot.c
 ramstage-y += gdt.c

src/arch/x86/boot/cbmem.c

@@ -49,13 +49,15 @@ void set_top_of_ram(uint64_t ramtop)
 	backup_top_of_ram(ramtop);
 	cbmem_late_set_table(ramtop - HIGH_MEMORY_SIZE, HIGH_MEMORY_SIZE);
 }
+#endif /* !__PRE_RAM__ */
 
+#if CONFIG_BROKEN_CAR_MIGRATE || !defined(__PRE_RAM__)
 unsigned long __attribute__((weak)) get_top_of_ram(void)
 {
 	printk(BIOS_WARNING, "WARNING: you need to define get_top_of_ram() for your chipset\n");
 	return 0;
 }
-#endif /* !__PRE_RAM__ */
+#endif
 
 #else
 

src/cpu/x86/Makefile.inc

@@ -1,5 +1,5 @@
 romstage-$(CONFIG_EARLY_CBMEM_INIT) += car.c
-romstage-$(CONFIG_HAVE_ACPI_RESUME) += car.c
+romstage-$(CONFIG_BROKEN_CAR_MIGRATE) += car.c
 
 subdirs-$(CONFIG_PARALLEL_MP) += name
 ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c

src/lib/Makefile.inc

@@ -103,7 +103,7 @@ romstage-y += dynamic_cbmem.c
 else
 ramstage-y += cbmem.c
 romstage-$(CONFIG_EARLY_CBMEM_INIT) += cbmem.c
-romstage-$(CONFIG_HAVE_ACPI_RESUME) += cbmem.c
+romstage-$(CONFIG_BROKEN_CAR_MIGRATE) += cbmem.c
 endif # CONFIG_DYNAMIC_CBMEM
 ramstage-y += cbmem_info.c
 

src/mainboard/asus/dsbf/Kconfig

@@ -11,6 +11,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_PIRQ_TABLE
 	select DRIVERS_I2C_W83793
 	select DRIVERS_GENERIC_IOAPIC
+	select BROKEN_CAR_MIGRATE
 
 config MAINBOARD_DIR
 	string

src/mainboard/intel/cougar_canyon2/Kconfig

@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SUPERIO_SMSC_SIO1007
 	select ENABLE_VMX
 	select EARLY_CBMEM_INIT
+	select BROKEN_CAR_MIGRATE
 
 config MAINBOARD_DIR
 	string

src/mainboard/iwave/iWRainbowG6/Kconfig

@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_ACPI_TABLES
 	select BOARD_ROMSIZE_KB_1024
 	select GFXUMA
+	select BROKEN_CAR_MIGRATE
 
 config MAINBOARD_DIR
 	string

src/mainboard/supermicro/x7db8/Kconfig

@@ -11,6 +11,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_PIRQ_TABLE
 	select DRIVERS_I2C_W83793
 	select DRIVERS_GENERIC_IOAPIC
+	select BROKEN_CAR_MIGRATE
 
 config MAINBOARD_DIR
 	string